Improvement in photographic cameras



Ew@ SQN .j UiTED lSterns PATENT Ormea 'rnonas woon, or BOSTON,MAss'AcngUsnrT's IM liFVEMENT l-N PHOTOGRAPH IC CAMERAS.

Specilication forming part of Letters Patent No. 472,524, dated April 26, 1864.

To all whom, it may concern.-

Beit known that I, THOMAS E. WOOD, of Boston, in the county of Suti'olk and State oi Massachusetts, have invented a new and useinl machine to bc applied to and connected with the instrument known as the camera obscura, for the purpose of moving in a horizontal and perpendicular direction one or hiere tubes of said instrument, and to be known as the independent camera-tube mover," and I do hereby declare that the following is a full, clear, and exact'description ot' the construction and operation of the same, reference being had to the accompanying drawings by numbers andletters, making them a part of this specitication, yin which- Figure 1 is' a perspective' view showing the door or slide moved horizontally to the lett vfrom the center; Fig. 2, a front elevation; Fig. 3,. a horizontal section through A B, *Figi/i, alongitudnal section.

Letters A Bi is a lineon which shown inf'No. 3 is made.-

. C is a circular opening in the door or slide E, for the purpose ofjnserting the lens or the section tube'.

DD are. two perpendicular bars, on which `-the door or slide E E is moved up and down b vmeans of the thumb-screw and pinion b,

which works in the rack f, said rack being inserted and iixed in the perpendicular bar D at the left oi the circular opening and behind the door or slide,.a s shown in horizontal sec tion through A. B,.No. 3,

F Fis a frame back of the door or slide `E gaand xed to the box H. 'j Lf-FG G are two horizontal bars connected with v"fthe perpendicular bars 1 D by the screws d d d d on thennderside of the upper bar and v the upper side ofthe lower bar Gr.

t gis a tongue which slides in the groove h in the horizontal parts of the frame F.

c is a screw and pinion which works in the rack t', said screw beingon the back ot'- the upper horizontal bar G.

i, the rack in which the `pinion works, is

placed on the back ot' the upper horizontal frame, F, as shown in: longitudinal section, No. 4L.v The action ot' pinion 0, moving in rack i, produces the horizontal movement of the door or slide E E. i

The door or slide is constructed of a thinv piece ot' wood, having 'a circular opening cut in the center and clamped on the sides with two upright pieces of the same material.

@n the haelt of the' door or slide are eutvertil'zontal pieces at top and bottom.

cally from top toA betteln two dovetailed notches, in which are inserted two vertical bars of dovetail section, said bars being so constructed that 'the door or slide can be moved on them up and down t`reely,'said being so constructed as not to interfere with f the vertical` movement' ofthe door or slide. On the under side of the upper and the upper side ofthe lower horizontal bars is a tongue running the whole length of each bar,

inserted and sliding in two grooves in a frame back of the door or slide and between the two said longitudinal hars.

The frame is constructed of four pieces 0f wood, two horizontal and two vert-ical pieces. The vertical pieces are tenoned into the hori- Said frame is attached by screws to a box inclosed on i'our sidesviz., sides, top, and bottom.

Un the lett'ot the circular opening is a thumb screw, connected with which is a pin-- gion which moves in a rack, said rack being let-into and'tixed to the small vertical bar to the left ot the circular Opening, by means of which thevdoor or slide is moved up and. down on the vertical bars.

lIn the center of the upper horizontal bar, and back of it, is attached athumb-screw, placed vertically, connected with which is a pinion Awhich'worksjn a rack, said rack being inserted and iixed upon the horizontal piece of the frame .on the back and flush with the top of said frame.

What I claim as my invention', and lesite to'l secure by Letters Patent, is-. The construction of a'thin pieeeof board, square or otherwise, with ,a circular or other opening for the purpose of admitting Lthe-lens or tube, in which said board are out two ver tical dovetailed notches, inserted inV which dovetailed notches are two vertical bars,

'which said vertical bars arepfastened at top and bottom to two horizontal bars or pieces tongned and inserted in grooves, so as to work or slide freely, said bars and board being so arranged as to 'ne moved by means ot' pinions and racks in a continuous vertical or horizontal direction.

THOMAS E. WOOD.

\\" i't1tess:s:

FRANCIS H. Beuren, Asa i/*vYnLLIN-Gron. 

